Update toolbar.coffee (#7199)
Update toolbar.coffee (#7199)

Missing import of logger.
https://github.com/bokeh/bokeh/edit/master/bokehjs/src/coffee/models/tools/toolbar.coffee#L35
Error is logged if event_type does not match and therefore a Reference error was raised because of the missing import.
aavanian/bokeh,rs2/bokeh,Karel-van-de-Plassche/bokeh,aavanian/bokeh,jakirkham/bokeh,timsnyder/bokeh,ericmjl/bokeh,ericmjl/bokeh,dennisobrien/bokeh,dennisobrien/bokeh,timsnyder/bokeh,aavanian/bokeh,mindriot101/bokeh,dennisobrien/bokeh,bokeh/bokeh,rs2/bokeh,jakirkham/bokeh,mindriot101/bokeh,ericmjl/bokeh,timsnyder/bokeh,timsnyder/bokeh,rs2/bokeh,Karel-van-de-Plassche/bokeh,Karel-van-de-Plassche/bokeh,stonebig/bokeh,dennisobrien/bokeh,dennisobrien/bokeh,bokeh/bokeh,jakirkham/bokeh,Karel-van-de-Plassche/bokeh,aavanian/bokeh,bokeh/bokeh,timsnyder/bokeh,jakirkham/bokeh,mindriot101/bokeh,stonebig/bokeh,stonebig/bokeh,mindriot101/bokeh,aavanian/bokeh,ericmjl/bokeh,rs2/bokeh,bokeh/bokeh,bokeh/bokeh,ericmjl/bokeh,stonebig/bokeh,rs2/bokeh,Karel-van-de-Plassche/bokeh,jakirkham/bokeh